The world of dogs is filled with a wide variety of breeds, offering options for every dog lover. When it comes to the smallest individual dog in the world, the title goes to Milly, a Chihuahua born in 2011. Recognized by Guinness World Records, Milly stands at just 9.65 centimeters (3.8 inches) tall and weighs only 1 pound. This tiny dog sleeps in a crib and exclusively eats food cooked by humans.

As for the smallest dog breed in the world, that distinction also goes to the Chihuahua. Purina, a pet food and care company, states that Chihuahuas typically range from 15 to 23 centimeters (5.9 to 9 inches) in height. They weigh between four to six pounds and can have varying coat lengths.

Following the Chihuahua, toy poodles are considered one of the smallest dog breeds, not exceeding 28 centimeters (11 inches) in height. They generally weigh between six and 10 pounds and have an average lifespan of up to 18 years.

On the other end of the size spectrum, the English Mastiff takes the title of the most giant dog breed. According to Purina, these dogs can reach heights of 27 to 35 inches and weigh between 200 to 230 pounds. They are often employed as security, police, military, and guard dogs due to their imposing size.

Coming in second for the largest dog breed is the Irish Wolfhound, which can grow up to 32 inches in height. Despite their massive size, they are known for their gentle and affectionate nature.

When it comes to the tallest individual dog, Zeus the Great Dane holds the record. Standing at three feet and slightly over five inches tall, Zeus is a Guinness World Record holder. Amazingly, when standing on his hind legs, he reaches an impressive height of seven feet and four inches.

The oldest recorded dog in history was Bluey, an Australian cattle dog that lived to the remarkable age of 29 years and five months before passing away in 1939. Currently, the oldest living dog is Pebbles, a Toy Fox Terrier who turned 22 in 2022. She holds the Guinness World Record and will celebrate her 23rd birthday on March 28, 2023.

These fascinating facts highlight the incredible diversity present within the world of dogs, from the tiniest Chihuahuas to the towering Great Danes.